import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
/**
 * Created by ScorpionOrange on 2016/07/21.
 */
public class ObjectAnalyzer {
    private ArrayList<Object> visited = new ArrayList<Object>();
    /**
     * Converts an object to a string representation that lists all fields.
     * @param obj an object
     * @return a string with the object's class name and all field names and values
     */
    public String toString(Object obj){
        if(obj == null) {
            return "null";
        }
        if(visited.contains(obj)){
            return "...";
        }
        visited.add(obj);
        Class cl = obj.getClass();
        if (cl == String.class) {
            return (String) obj;
        }
        if(cl.isArray()){
            String r = cl.getComponentType() + "[]{";
            for(int i = 0; i < Array.getLength(obj); i++){
                if(i > 0){
                    r += ",";
                }
                Object val = Array.get(obj, i);
                if(cl.getComponentType().isPrimitive()){
                    r += val;
                }
                else {
                    r += toString(val);
                }
            }
            return r + "}";
        }
        String r = cl.getName();
        //inspect the fields of this class and all superclasses
        do {
            r += "[";
            Field[] fields = cl.getDeclaredFields();
            AccessibleObject.setAccessible(fields,true);
            //get the names and values of all fields
            for(Field f : fields){
                if(!Modifier.isStatic(f.getModifiers())){
                    if(!r.endsWith("[")){
                        r += ",";
                    }
                    r += f.getName() + "=";
                    try{
                        Class t = f.getType();
                        Object val = f.get(obj);
                        if(t.isPrimitive()){
                            r += val;
                        }
                        else {
                            r += toString(val);
                        }
                    }
                    catch (Exception e){
                        e.printStackTrace();
                    }
                }
            }
            r += "]";
            cl = cl.getSuperclass();
        }
        while (cl != null);

        return r;
    }
}
